 (defn mappify
   "Takes a sequence of row vectors, as commonly produced by csv parsing libraries, and returns a sequence of
   maps. By default, the first row vector will be interpreted as a header, and used as the keys for the maps.
-  However, this and other behaviour are customizable via an optional `opts` map with the following options:
+  However, this and other behaviors are customizable via an optional `opts` map with the following options:
 
   * `:keyify` - bool; specify whether header/column names should be turned into keywords (default: `true`).
   * `:header` - specify the header to use for map keys, preventing first row of data from being consumed as header."

  * `:cast-exception-handler` - If cast-fn raises an exception, this function will be called with args
    `colname, value`, and the result used as the parse value.
  * `:cast-only` - Only cast the specified column(s); can be either a single column name, or a vector of them."
  ([{:keys [mappify keyify header remove-comments comment-re comment-char structs cast-fns cast-exception-handler cast-only]
     :or   {mappify         true
            keyify          true

          (if except-first
            (if @fst
              (rf results (impl/cast-row cast-fns input :only only :exception-handler exception-handler))  ;; we captured the first already, keep reducing.
              (do (vreset! fst input) (rf results input)))                                                 ;; fst is nil. reset fst and return the results.
            (rf results (impl/cast-row cast-fns input :only only :exception-handler exception-handler)))))))))

;; Let's try casting a numeric column using this function:
